m90-97riv

Will a Eaton m90 bolt on as a replacement for my 97 Riviera w/o modification? My SC coupler exploded so just going to replace the whole supercharger vs rebuilding it and I found a m90 off a 97 gtp w 90k miles on it for $50

Hey Matt,

If it's only the coupler that's the problem, then I personally suggest just replacing the coupler. Simple job, especially on the Series II L67. You don't even have to remove the supercharger!

To answer your question though, yes the M90 you found should work fine, but it's a LOT less work to replace the coupler. And don't forget the couple new gaskets you'd need if you took the blower off!

There is aluminum debris and fillings in the SC fluid. The biggest piece I seen was about. .0225" knowing this would replacing the coupler fix it or is there more to be worried about? Also not making any boost not sure if that common when the coupler goes or not this is my first forced air car.

Aluminum eh? Hmm. I suppose it depends where the aluminum debris came from exactly, but there is a good chance the snout bearings MAY be compromised.

Yes, the reason you're not getting any boost is because the snout is no longer connected to the blower's rotors because the coupler is gone. It's possible the aluminum pieces are from the lobes that connect to the coupler. Maybe one of the other guys on here can chime in?

Another option, to avoid removing the blower completely, is getting a new coupler, supercharger oil, and swapping the snout from the new blower.

I'd be more questioning why the coupler exploded. That indicates another major problem.

^What Karma said. Possibly bound up rotors? Seems odd..

I would go ahead and do the blower swap. Before doing the swap, consider replacing eht coupler in the replacement blower, and check bearnigs for any play. Darossi LLC for instance sells overhaul kits with bearings, fluid and coupler if you want. . Bearing swap is not too bad to do/have done with the blower off the car. Have to be careful pulling/reinstalling the blower impellers. Point is if you go ahead and put in a good replacement coupler (and bearings if needed), this blower swap becomes basically a "once and done" job. You'll have put on a new LIM gasket which is about the only headaches this engine has if it is otherwise well maintained. You'll be able to put in a better coupler than what came new (the replacement machined polymer couplers are quite good actually - read about the coupler, easy to do on-line, to see which are machined and which not).

...whatever you do, good luck. It'll work out.

OK so I just bought a rebuilt Eaton SC not really sure what model just know its not a m90 or l67. The snout looks a lot shorter then the one on my car. Do I need to swap the snout? Or will it line up when I put it in? I hope I don't need to swap them since my current one has a bad coupler and a compressed bearing.

Sounds like an M62, from the '95 Rivieras with the Series I L67.

So you knew you needed an M90 blower for your L67, and you bought a blower that's not an M90 and doesn't go on an L67? What were you expecting?

I'll giva ya ten bucks for it

The supercharger I bought came off a riv that was a series 2 so why the hell would it be different? I'm sick of dealing with pos GM cars!!! And will sell this pos Riviera and buy a Ford or a mopar that is Carb screw fuel injection and screw forced air.

FERGI'S 97 SC RIV wrote:

The supercharger I bought came off a riv that was a series 2 so why the hell would it be different? I'm sick of dealing with pos GM cars!!! And will sell this pos Riviera and buy a Ford or a mopar that is Carb screw fuel injection and screw forced air.

yer a friggin comm unist

robotennis61 wrote:

FERGI'S 97 SC RIV wrote:

The supercharger I bought came off a riv that was a series 2 so why the hell would it be different? I'm sick of dealing with pos GM cars!!! And will sell this pos Riviera and buy a Ford or a mopar that is Carb screw fuel injection and screw forced air.

yer a friggin comm unist

Open your eyes the USA is Communist.

..jee,maybe yer rite!? say,uh..are ya into prince alberts!

Bolt pattern on SC case is same will bolt on only difference is the snout. Dose anyone know if I would be able to swap the snout on my new SC with one that is long enough?

FERGI'S 97 SC RIV wrote:

Bolt pattern on SC case is same will bolt on only difference is the snout. Dose anyone know if I would be able to swap the snout on my new SC with one that is long enough?

I have not done that swap, and IIRC there were engineering changes to the later (m90) rotors. I think the coating. So it would not surprise me if it worked, but again I have not done it myself. Good luck - maybe the thing to do is try it by fitting the parts together and spinning it by hand while checking for interference. And again while you are at it consider replacing that coupler... Note I Am not saying "oh just replace the coupler" you clarified that the bower you got was rebuilt. I am saying take a look at the coupler in it while you have it apart and make a good guess as to its fitness for use, and if for some reason it seems unfit then replace it.

I'm interested in what blower your replacement is. Can you post pics?

If it came from a riv and it for sure is an m90, then its a gen 3 m90 and should swap right over. If the snout is short and it for sure is an m90 if might be a ford M90, but in that case didn't at all come from a riv. If the snout is short and you are positive its from a riv, then it has to be the smaller m62. If it came from an 2002+ gtp, there is a chance its an GenV m90, which can be swapped over with a few changes.

Post pics and I can ID the blower. If you did get something weird, with pics I can tell you for sure if the snout will work because I have an embarrassing number of different blowers around here I can do test snout swaps for you.

OK I will work on getting some pics uploaded of the superchargers. I would greatly appreciate any and all help.
The coupler in both superchargers are BAD and the one currently on the car feels like its not there at all. And the new supercharger has none at all the guy who rebuilt it used a loaner coupler to test it after rebuild.

now we are making progress... looking for those pics and the right person (Karma) is on the case... peace out...

Albertj

Karma wrote:

If it came from an 2002+ gtp, there is a chance its an GenV m90, which can be swapped over with a few changes.

Post pics and I can ID the blower. If you did get something weird, with pics I can tell you for sure if the snout will work because I have an embarrassing number of different blowers around here I can do test snout swaps for you.

04 and newer is a gen V blower.

You can easily identify a Gen V from a Gen 3. A gen 3 will have a stud sticking up in the center on top to allow for the nut to go over and hold the fuel rails in place. The Gen V does not have this.

The M62 will not bolt to a L67 LIM as the bolt pattern is different on a series I.

Thanks! Yup, sorry, 02 was a typo.

Also GenV will have a thinner rotor-pack plate, non-finished SC snout, extra passages at the back, different outlet, and obviously the better rotor coating. Oh and the material used for the casting is a slightly different composition of aluminum than earlier ones, it’s a little denser and takes more work to finish and smooth properly.


..and we are pretty familiar with the m62 over here too The main thing is to ID what blower he's gotten his hands on.

Sorry guys having a issue uploading photos from phone will try with computer tomorrow!

The replacement I bought is the m62

I hope you didn't pay much for it. (They honestly are not worth much, but people still try and sell them for a bundle.)